Ingredients 1 hothouse cucumber, unpeeled, seeded, and sliced 1/4-inch thick 1 red bell pepper, large-diced 1 yellow bell pepper, large-diced 1 pint cherry or grape tomatoes, halved 1/2 red onion, sliced in half-rounds 1/2 pound feta cheese, 1/2-inch diced (not crumbled) 1/2 cup calamata olives, pitted For the vinaigrette: 2 cloves garlic, minced 1 teaspoon dried oregano 1/2 teaspoon Dijon…